<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <p>{{msg}}</p>
      <button @click="fn(msg)">逆转世界</button>
    </div>
  </body>
  <script src="../vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        msg: 'Hello,World'
      },
      methods: {
        fn(msg) {
          // split()将字符串按特定的方式分割重组为一个数组
          // reverse()用于颠倒数组中元素的顺序
          // join()将数组按特定的方式重组股为一个字符串
          this.msg = this.msg.split('').reverse().join('')
        }
      }
    })
  </script>
</html>
